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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507bd33ad7670363d6df2726e143b83642814a6eb34010ef078f3ec9092f4797' 
  AND token = 'QR2ARtJKhzgVkQXGHuiT30pdxGmQ6da+pItNitgkoVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}